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WO1998006188A1 - Telecommunications sur ligne de puissance - Google Patents

Telecommunications sur ligne de puissance Download PDF

Info

Publication number
WO1998006188A1
WO1998006188A1 PCT/GB1997/002028 GB9702028W WO9806188A1 WO 1998006188 A1 WO1998006188 A1 WO 1998006188A1 GB 9702028 W GB9702028 W GB 9702028W WO 9806188 A1 WO9806188 A1 WO 9806188A1
Authority
WO
WIPO (PCT)
Prior art keywords
signal
line
cancelling
signals
coupling
Prior art date
Application number
PCT/GB1997/002028
Other languages
English (en)
Inventor
Robin Paul Rickard
Original Assignee
Northern Telecom Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Northern Telecom Limited filed Critical Northern Telecom Limited
Priority to DE69706997T priority Critical patent/DE69706997T2/de
Priority to AU37016/97A priority patent/AU3701697A/en
Priority to EP97933773A priority patent/EP0916194B1/fr
Priority to US09/230,011 priority patent/US6785532B1/en
Priority to AT97933773T priority patent/ATE206255T1/de
Publication of WO1998006188A1 publication Critical patent/WO1998006188A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/54—Systems for transmission via power distribution lines
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/54—Systems for transmission via power distribution lines
    • H04B3/56—Circuits for coupling, blocking, or by-passing of signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2203/00—Indexing scheme relating to line transmission systems
    • H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
    • H04B2203/5404—Methods of transmitting or receiving signals via power distribution lines
    • H04B2203/5408—Methods of transmitting or receiving signals via power distribution lines using protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2203/00—Indexing scheme relating to line transmission systems
    • H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
    • H04B2203/5429—Applications for powerline communications
    • H04B2203/5441—Wireless systems or telephone
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2203/00—Indexing scheme relating to line transmission systems
    • H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
    • H04B2203/5429—Applications for powerline communications
    • H04B2203/5458—Monitor sensor; Alarm systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2203/00—Indexing scheme relating to line transmission systems
    • H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
    • H04B2203/5462—Systems for power line communications
    • H04B2203/5466—Systems for power line communications using three phases conductors
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2203/00—Indexing scheme relating to line transmission systems
    • H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
    • H04B2203/5462—Systems for power line communications
    • H04B2203/5483—Systems for power line communications using coupling circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2203/00—Indexing scheme relating to line transmission systems
    • H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
    • H04B2203/5462—Systems for power line communications
    • H04B2203/5491—Systems for power line communications using filtering and bypassing

Definitions

  • This invention relates to an apparatus and method for coupling signals onto a transmission line. It has particular application to coupling radio frequency (RF) signals onto an electricity distribution network which is used to transport telecommunications signals.
  • RF radio frequency
  • Patent Application WO 94/09572 A1 (NORWEB) describes such a network. Delivering a telecommunications service in this manner is attractive as it overcomes one of the greatest costs in providing a new telecommunications network i.e. installing cabling to each subscriber. Existing electricity distribution cabling is used to carry the telecommunications signals.
  • Figure 1 shows an electricity distribution network which is adapted to carry telecommunications signals.
  • Mains electricity enters the network from an 11 kV transmission line 105 and is transformed by substation 100 into a 415V supply which is delivered over cable 120 to subscribers S.
  • a base station BS couples telecommunications signals V ⁇ , such as voice and data signals, at injection point 110 onto distribution cable 120.
  • the telecommunications signals propagate over the cable on radio frequency carriers to transceiver units TRX at subscriber premises S.
  • One of the problems with transporting RF signals over the electricity distribution network is that of unwanted radiation of RF energy.
  • the distribution network was not designed to carry RF signals.
  • Electricity distribution cables such as cable 120
  • the inner section of the cable comprises groups of conductors which carry one or more of the three supply phases. This inner section is surrounded by an outer section which is coupled to earth.
  • These cables have similar screening properties to coaxial cables, and conveniently this screening, coupled with the underground burial of the cables, is effective at the radio frequencies (RF) that are used for transporting telecommunications signals.
  • RF radio frequencies
  • the internal wiring at subscribers' premises S is unscreened, and could potentially cause radiation problems. However, by filtering off the RF signals at the point where the electricity feeder cable becomes unscreened radiation of RF signals is minimised.
  • Substations have busbars which are typically mounted as a grid array on the substation wall.
  • the busbars are shielded from view but frequently are electrically unscreened. This is because screening is considered unnecessary at the 50Hz mains frequency.
  • the busbar array functions as an antenna, radiating the RF signals which it receives via the distribution cables into the surrounding area. This is undesirable as it causes interference with equipment operating at these frequencies. This radiation may also violate regulations on Electromagnetic Compatibility (EMC).
  • EMC Electromagnetic Compatibility
  • An alternative solution to the radiation problem is to restrict the power at which the RF signals are transmitted over the network, such that radiation occurring at substations falls below acceptable limits. This causes problems with subscribers' equipment, particularly to those subscribers furthest from the point at which RF signals are injected onto the network. Subscriber equipment needs an acceptable signal to interference ratio in order to detect the wanted RF signals. With considerable interference on the network, this demands a reasonably high transmit power.
  • the problem of radiation at the substation is compounded by the fact that RF signals are usually injected onto the distribution network adjacent to the substation.
  • the reason for injecting at this point is because one base station can easily be coupled to each of a group of 415V cables (120, 130, 140 in figure 1 ) which all converge at the substation.
  • the present invention seeks to minimise the above problem.
  • an apparatus for coupling signals to a line comprising:
  • the cancelling signal is derived from the wanted signal by a cancelling means.
  • the cancelling means comprises a weight which is operable to phase-shift and scale the wanted signal in amplitude.
  • the spacing of the first and second couplers is substantially one quarter of a wavelength of the wanted signal This maximises signal power in the wanted direction of propagation
  • the calculating means may alternatively perform an iterative technique in which the sensed signal is correlated with a portion of the wanted signal to determine updated weight values
  • the apparatus is used to couple telecommunications signals to a power line such as a distribution line of an electricity distribution network for serving a plurality of subscribers
  • a further application of controlling the direction of propagation of signals along the line is in allowing a particular frequency band which is in use on one line to be reused on the other lines This has a particular use where an electricity distribution network has several distribution lines served by a common substation
  • a further aspect of the invention provides a method of coupling signals to a line, the method comprising:
  • a further aspect of the invention provides a method of coupling communications signals on to an electricity distribution network comprising a substation serving a plurality of distribution lines, the method comprising: - coupling communications signals occupying a frequency band to one of the lines in a manner according to claim 13 such that they destructively combine in a direction of propagation towards the substation; and,
  • Figure 1 shows an electricity distribution network which is adapted to transport telecommunications signals
  • Figure 2 shows part of the network of figure 1 in more detail
  • Figure 3 shows an arrangement to minimise radiation from an unscreened part of the network of figures 1 and 2;
  • Figure 4 describes the operation of the arrangement of figure 3
  • Figure 5 shows the arrangement of figure 3 modified to include a monitoring circuit
  • Figure 6 shows one form of calculating circuit for use in the arrangement of figure 5
  • Figure 7 shows an alternative form of calculating circuit for use in the arrangement of figure 5;
  • Figure 8 shows an improvement to the arrangement of figure 5;
  • Figure 9 shows frequency reuse in an electricity distribution network.
  • Distribution cable 120 has three separate phase lines: Blue, Red and Yellow. Each of the phase lines are coupled to a respective busbar in substation 100.
  • the output of basestation BS is coupled to a three-way splitter 210. Each of the three output lines is coupled, via a high-pass filter unit 200 to a respective phase line of cable 120.
  • the mains filter serves to pass only signals in the RF bands which are used for transmission of telecommunications signals and to block the flow of mains electricity into the basestation.
  • Telecommunications signals propagate along cable 120 in two directions; towards substation 100 and towards subscribers. Signal V ⁇ is shown on the blue phase line. Telecommunications signals reaching substation 100 radiate RF energy 220.
  • Figure 3 shows the same section of the network as that shown in figure 2, but with modifications to minimise propagation of RF signals along cable 120 towards substation 100.
  • the output of basestation BS is split, as before, into a feed for each phase line.
  • the feed for each phase line is split into two components; a main component V ma j n , and a cancelling component V a ux .
  • Vmain couples to cable 120 at position Y via a high-pass filter 200, as before.
  • V aU ⁇ is coupled to cable 120 at a position X, spaced from position Y by a distance d.
  • V a u ⁇ is weighted by a weight WB which phase-shifts the signal, and can also scale the signal in amplitude.
  • V aux and V ma j n are related in phase such that at point X, and in the direction towards substation 100, V aux and V ma in are offset in phase by 180° i.e. they are in anti-phase and destructively cancel. Therefore, the section of cable between point X and the busbars carries no RF signals, or RF signals at much reduced levels. Point X could be located at the busbars themselves.
  • Joints at points X and Y should be made using the same jointing technique, such that the RF coupling characteristics track in amplitude and phase. This gives optimum broadband cancelling performance.
  • V ma in and V aux can be related in phase such that at point Y (and along the cable towards subscribers) they are in phase i.e. they constructively combine.
  • Typical transmission frequencies are the bands 2-6MHz and 10-14MHz.
  • the typical level at which the main signal can be coupled onto the line is 1 Vrms. Such a high level may cause radiation problems in conventional systems.
  • the delays and phase shifts are arranged such that signals injected from the main feed and the auxiliary feed, and propagating towards the bus bars from point X, destructively interfere, but the signals propagating along cable 120 away from the bus bars do not destructively interfere.
  • the magnitude of the resultant signal will depend on the carrier frequency, with the maximum amplitude occurring when the delay 2x* produces a phase shift of 180°, such that when combined with the phase shift through the weight a total phase shift of 360° is obtained giving constructive interference.
  • FIG. 5 shows the arrangement of figure 3, further modified so that it is possible to monitor the success of the cancellation process.
  • Sensing coils 600, 610, 620 are arranged, one per phase line, to detect signals present on the busbar.
  • the sensing should preferably be by an inductive coil which is wound around the busbar, or laid closely adjacent to it. Sensing is also possible by a capacitive link or by one or more antennas located close to the busbars.
  • Each sensing coil is coupled to a switch 630 and a weight calculation unit 640.
  • the weight calculation unit outputs control signals to each of the weights, W ⁇ , WR, Wy.
  • Switch 630 allows a single calculation unit to be time-shared among the monitoring signals.
  • Calculation unit 640 operates to apply weight values which minimise the level of the monitoring signal detected by the sensing coils. An attenuated signal is adequate for monitoring, and this allows weakly coupled inductive coils to be used.
  • weight calculation unit 640 The operation of the weight calculation unit 640 will now be described. There are two main methods of calculating weight values; by perturbation and by a correlation technique.
  • FIG. 6 shows a weight cancelling unit which performs the perturbation technique.
  • a monitoring signal is applied to a channel filter 700, which passes only those frequencies which are of interest (the RF frequencies which are to be cancelled).
  • a power detector 710 shown simply as a diode detector D and capacitor C, provide a power measurement which is applied to an analogue to digital converter 720.
  • the output of the A-D converter is fed to a microprocessor 730 which performs a perturbation algorithm.
  • the microprocessor outputs a set of weight control signals which control the in-phase (I) and quadrature (Q) elements of each weight.
  • the perturbation process works by applying steps in the size of I and Q weight values and monitoring how that affects the cancellation.
  • the algorithm can work by successively changing I up, I down, Q up, Q down. After these four steps have been performed the change in I or Q which had the best effect is adopted. This process continues until the best cancellation effect is achieved.
  • the second technique for calculating weight values is by correlation. This is shown in figure 7.
  • an input from the sensing coils is applied to a filter, which passes only the band of RF frequencies which are of interest.
  • the filtered signal is split, by a coupler 740 into in-phase (I) and quadrature (Q) components. This forms the sum component (S).
  • a portion of the input signal from the basestation BS is split by splitter 780 and fed into a second coupler 750 which also splits the signal into I and Q components. This forms the element component (E).
  • the two sets of I and Q components are fed to a correlator 760.
  • A-D converters operate on each of the four inputs to the device.
  • the correlator performs a correlation of the E and S components and outputs the result to a microprocessor 770 which performs a weight update algorithm.
  • a typical algorithm is:
  • Microprocessor 770 outputs a set of control signals to control the value of the weights. This technique, similarly to the perturbation technique, is iterative, and is repeated until the best cancellation is achieved.
  • the weight calculation process should only need to be repeated periodically.
  • Cancellation is most effective at the carrier frequency where the main and auxiliary signals are exactly in anti-phase. Moving each side of this frequency the cancellation effect will be decreasingly less effective. This is due to imperfections in the tracking over frequency between the phase and amplitude responses of the main and auxiliary channels and due to mismatch in the delay.
  • the centre frequency of the band is chosen as the frequency where cancellation ' is most effective, e.g. 4MHz for the band 2-6MHz. This scheme is therefore most effective with TDMA systems such as DECT, which employ a limited number of time- shared carriers.
  • a broader band cancellation is possible by modifying the arrangement as shown in figure 8.
  • the signals in the auxiliary path are split into several portions, which are each delayed by differing amounts and separately weighted before recombination.
  • the weights are under the under control of the adaptive loop, and adapted in turn in a time-shared manner.
  • TDMA time division multiple access
  • TDD time division duplex
  • Cancellation is operable during the period when the base station is transmitting downstream.
  • the basestation receive period when subscribers transmit upstream, the auxiliary path is not used and the basestation receives only via the main path
  • the auxiliary path can be utilised in addition to the main path during the receive cycle.
  • the auxiliary path needs to establish the same amplitude and phase response in both receive and transmit directions.
  • FIG. 9 shows an electricity distribution network with a substation 100 which serves three distribution cables 120, 130, 140. Each distribution cable is served by a respective communications base station BS1 , BS2, BS3.
  • the common coupling of cables 120, 130, 140 at substation 100 means that telecommunications signals from one line, eg line 120, will flow onto the other lines 130, 140. Coupling telecommunications signals onto each line so that they propagate away from the substation, and have a negligible component in the direction towards the substation, allows the same frequency band to be used by each base station BS1 , BS2, BS3. Frequency reuse may be desirable where traffic demand from the subscribers on each line requires a base station to serve just that line, but there is only a limited band of frequencies available for power line communication. The limit on the band of frequencies for power line communications may be due to government regulations or because it is found that a particular band of frequencies offers optimum performance.
  • signals V,, V 2 , V 3 represent the directional transmissions from base stations BS1 , BS2, BS3 which can each share a common frequency band.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Communication Control (AREA)
  • Glass Compositions (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Paper (AREA)
  • Details Of Aerials (AREA)
  • Optical Communication System (AREA)
  • Coupling Device And Connection With Printed Circuit (AREA)

Abstract

On décrit un appareil destiné à coupler des signaux vers une ligne de transmission, telle qu'une ligne de puissance (120), et comprenant: - une entrée destinée à recevoir un signal voulu, - un premier coupleur servant à coupler le signal voulu (V¿principal?) sur la ligne au niveau d'une première position (Y), - des moyens d'annulation (WB, WR, WY) couplés à l'entrée, aux fins de dériver un signal d'annulation (Vaux) à partir du signal voulu, - un second coupleur pour coupler le signal d'annulation sur la ligne au niveau d'une seconde position (X), espacée de la première, cet appareil étant caractérisé en ce que le signal voulu et le signal d'annulation se combinent de manière destructrice dans une seule direction de propagation le long de la ligne tout en permettant au signal voulu de se propager dans l'autre direction le long de la ligne. On peut utiliser cet appareil pour minimiser le rayonnement provenant d'un élément non blindé d'un réseau de distribution d'électricité, tel qu'une sous-station (100), ou pour permettre une réutilisation d'une bande de fréquence sur d'autres lignes de puissance.
PCT/GB1997/002028 1996-08-01 1997-07-25 Telecommunications sur ligne de puissance WO1998006188A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE69706997T DE69706997T2 (de) 1996-08-01 1997-07-25 Nachrichtenübertragung über starkstromleitung
AU37016/97A AU3701697A (en) 1996-08-01 1997-07-25 Power line communications
EP97933773A EP0916194B1 (fr) 1996-08-01 1997-07-25 Telecommunications sur ligne de puissance
US09/230,011 US6785532B1 (en) 1996-08-01 1997-07-25 Power line communications
AT97933773T ATE206255T1 (de) 1996-08-01 1997-07-25 Nachrichtenübertragung über starkstromleitung

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9616142.7A GB9616142D0 (en) 1996-08-01 1996-08-01 Distribution network
GB9616142.7 1996-08-01

Publications (1)

Publication Number Publication Date
WO1998006188A1 true WO1998006188A1 (fr) 1998-02-12

Family

ID=10797834

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1997/002028 WO1998006188A1 (fr) 1996-08-01 1997-07-25 Telecommunications sur ligne de puissance

Country Status (7)

Country Link
US (1) US6785532B1 (fr)
EP (1) EP0916194B1 (fr)
AT (1) ATE206255T1 (fr)
AU (1) AU3701697A (fr)
DE (1) DE69706997T2 (fr)
GB (1) GB9616142D0 (fr)
WO (1) WO1998006188A1 (fr)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999018675A3 (fr) * 1997-10-03 1999-06-24 Northern Telecom Ltd Couplage de signaux de communications avec une ligne de transport d'energie
WO1999003209A3 (fr) * 1997-07-11 1999-08-12 Northern Telecom Ltd Transmission de signaux de communication a travers un reseau de distribution d'energie electrique
WO1999048222A1 (fr) * 1998-03-17 1999-09-23 Northern Telecom Limited Transmission de signaux de telecommunications sur un reseau de lignes d'alimentation
DE19821045A1 (de) * 1998-05-11 1999-11-18 Abb Research Ltd Vorrichtung und Verfahren zur Signaleinkopplung in Hoch- und Mittelspannungsleitungen
EP0961415A1 (fr) * 1998-05-25 1999-12-01 Abb Research Ltd. Méthode et appareil pour la transmission de données ou respectivement le couplage de signaux au moyen de lignes d'alimentation
WO2000021212A1 (fr) * 1998-10-07 2000-04-13 Krone Gmbh Procede et circuit pour la transmission de donnees sur des lignes de transport d'energie
EP1003294A3 (fr) * 1998-11-19 2002-05-15 Abb Research Ltd. Procédé de communication sur ligne à haute tension
US6404773B1 (en) 1998-03-13 2002-06-11 Nortel Networks Limited Carrying speech-band signals over a power line communications system
EP1286476A1 (fr) * 2001-08-23 2003-02-26 Abb Research Ltd. Procédé pour transmettre des signaux de communication
FR2829640A1 (fr) * 2001-09-13 2003-03-14 Electricite De France Procede de transmission d'informations par signaux cpl hf dans une canalisation de transport d'energie electrique triphasee, et dispositif de couplage triphase pour signaux cpl hf pour sa mise en oeuvre
EP0963058A3 (fr) * 1998-06-02 2004-03-31 Ibiden Industries Co., Ltd. Appareil et procédé de transfert sur des lignes électriques de distribution
WO2009109731A1 (fr) * 2008-03-06 2009-09-11 Freedom Digital Networks Limited Procédé d'installation de réseau à courant porteur en ligne
EP2146440A4 (fr) * 2007-04-25 2014-07-16 Zao Electro Com Procédé pour amener et lire un signal avec des données numériques dans le réseau de distribution d'électricité d'un immeuble

Families Citing this family (43)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6480510B1 (en) 1998-07-28 2002-11-12 Serconet Ltd. Local area network of serial intelligent cells
BR9917572A (pt) 1999-12-08 2002-08-06 Ascom Powerline Comm Ag Disposição para a transmissão de informações através de uma rede de suprimento de corrente-baixa tensão
EP1252727A1 (fr) 2000-01-20 2002-10-30 Current Technologies LLC Procede d'isolation de donnees dans un reseau de communications a ligne electrique
US7176786B2 (en) * 2000-01-20 2007-02-13 Current Technologies, Llc Method of isolating data in a power line communications network
AU5540101A (en) 2000-04-14 2001-10-30 Current Tech Llc Digital communications utilizing medium voltage power distribution lines
US6998962B2 (en) 2000-04-14 2006-02-14 Current Technologies, Llc Power line communication apparatus and method of using the same
US7103240B2 (en) 2001-02-14 2006-09-05 Current Technologies, Llc Method and apparatus for providing inductive coupling and decoupling of high-frequency, high-bandwidth data signals directly on and off of a high voltage power line
US6965302B2 (en) 2000-04-14 2005-11-15 Current Technologies, Llc Power line communication system and method of using the same
US6842459B1 (en) 2000-04-19 2005-01-11 Serconet Ltd. Network combining wired and non-wired segments
US7248148B2 (en) 2000-08-09 2007-07-24 Current Technologies, Llc Power line coupling device and method of using the same
US6980089B1 (en) 2000-08-09 2005-12-27 Current Technologies, Llc Non-intrusive coupling to shielded power cable
US7245201B1 (en) 2000-08-09 2007-07-17 Current Technologies, Llc Power line coupling device and method of using the same
EP1371219A4 (fr) * 2001-02-14 2006-06-21 Current Tech Llc Communication de donnees par ligne electrique
US7245472B2 (en) * 2001-05-18 2007-07-17 Curretn Grid, Llc Medium voltage signal coupling structure for last leg power grid high-speed data network
US7053756B2 (en) 2001-12-21 2006-05-30 Current Technologies, Llc Facilitating communication of data signals on electric power systems
US7199699B1 (en) 2002-02-19 2007-04-03 Current Technologies, Llc Facilitating communication with power line communication devices
US7102478B2 (en) 2002-06-21 2006-09-05 Current Technologies, Llc Power line coupling device and method of using the same
US6982611B2 (en) 2002-06-24 2006-01-03 Current Technologies, Llc Power line coupling device and method of using the same
US7132819B1 (en) 2002-11-12 2006-11-07 Current Technologies, Llc Floating power supply and method of using the same
US7076378B1 (en) 2002-11-13 2006-07-11 Current Technologies, Llc Device and method for providing power line characteristics and diagnostics
US7075414B2 (en) 2003-05-13 2006-07-11 Current Technologies, Llc Device and method for communicating data signals through multiple power line conductors
US6965303B2 (en) 2002-12-10 2005-11-15 Current Technologies, Llc Power line communication system and method
US7064654B2 (en) 2002-12-10 2006-06-20 Current Technologies, Llc Power line communication system and method of operating the same
US6980091B2 (en) 2002-12-10 2005-12-27 Current Technologies, Llc Power line communication system and method of operating the same
US6980090B2 (en) 2002-12-10 2005-12-27 Current Technologies, Llc Device and method for coupling with electrical distribution network infrastructure to provide communications
US7046124B2 (en) 2003-01-21 2006-05-16 Current Technologies, Llc Power line coupling device and method of using the same
IL154921A (en) 2003-03-13 2011-02-28 Mosaid Technologies Inc A telephone system that includes many separate sources and accessories for it
US7308103B2 (en) 2003-05-08 2007-12-11 Current Technologies, Llc Power line communication device and method of using the same
US7460467B1 (en) 2003-07-23 2008-12-02 Current Technologies, Llc Voice-over-IP network test device and method
US7113134B1 (en) 2004-03-12 2006-09-26 Current Technologies, Llc Transformer antenna device and method of using the same
US20050226200A1 (en) * 2004-03-26 2005-10-13 Edgecom A Power Line Communication System that Enables Low-Cost Last Mile Access to any Legacy or Emerging Network Infrastructure
US7307512B2 (en) 2005-04-29 2007-12-11 Current Technologies, Llc Power line coupling device and method of use
US7319717B2 (en) * 2005-06-28 2008-01-15 International Broadband Electric Communications, Inc. Device and method for enabling communications signals using a medium voltage power line
US7414526B2 (en) * 2005-06-28 2008-08-19 International Broadband Communications, Inc. Coupling of communications signals to a power line
US7522812B2 (en) * 2005-07-15 2009-04-21 International Broadband Electric Communications, Inc. Coupling of communications signals to a power line
US7667344B2 (en) * 2005-07-15 2010-02-23 International Broadband Electric Communications, Inc. Coupling communications signals to underground power lines
US7778514B2 (en) * 2005-07-15 2010-08-17 International Broadband Electric Communications, Inc. Coupling of communications signals to a power line
DE602006008046D1 (de) * 2006-02-01 2009-09-03 Jonathan Hylton Verfahren und system zur bereitstellung von konnektivität eines beweglichen objektes zu einem externen netz
US7714682B2 (en) * 2007-06-21 2010-05-11 Current Technologies, Llc Power line data signal attenuation device and method
US7795994B2 (en) * 2007-06-26 2010-09-14 Current Technologies, Llc Power line coupling device and method
US7876174B2 (en) 2007-06-26 2011-01-25 Current Technologies, Llc Power line coupling device and method
US20090085726A1 (en) * 2007-09-27 2009-04-02 Radtke William O Power Line Communications Coupling Device and Method
US8376286B2 (en) * 2010-06-18 2013-02-19 General Electric Company Foreign track current suppression system and method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2523090A1 (de) * 1974-06-28 1976-01-15 Ibm Breitband-signalgenerator
DE3151143A1 (de) * 1981-12-23 1983-07-14 Siemens AG, 1000 Berlin und 8000 München Schaltungsanordnung zur unterdrueckung von signalen auf leitungsabschnitten

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2418981A1 (fr) 1978-03-03 1979-09-28 Lignes Telegraph Telephon Circuit d'amplification pour telecommunication en hyperfrequence
US4450417A (en) 1981-12-28 1984-05-22 Rockwell International Corporation Feed forward circuit
US4458236A (en) 1982-04-13 1984-07-03 Rockwell International Corporation Communications signal coupling around wye/delta power transformation
US4782307A (en) 1987-06-08 1988-11-01 Hughes Aircraft Company Feed-forward microwave amplifier arrangement with ferrite temperature compensation
US4841281A (en) 1987-06-16 1989-06-20 Westinghouse Electric Corp. Apparatus for controlling a switching amplifier
CA2046413C (fr) 1990-07-11 1994-01-04 Shoichi Narahashi Amplificateur a correction aval
US5706354A (en) 1995-07-10 1998-01-06 Stroehlein; Brian A. AC line-correlated noise-canceling circuit
US5832364A (en) 1995-10-06 1998-11-03 Airnet Communications Corp. Distributing wireless system carrier signals within a building using existing power line wiring
US5874856A (en) 1997-06-30 1999-02-23 Motorola, Inc. Feed forward amplifier
US6285252B1 (en) 1999-09-30 2001-09-04 Harmonic Inc. Apparatus and method for broadband feedforward predistortion
JP3877937B2 (ja) 2000-05-18 2007-02-07 株式会社エヌ・ティ・ティ・ドコモ フィードフォワード増幅器

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2523090A1 (de) * 1974-06-28 1976-01-15 Ibm Breitband-signalgenerator
DE3151143A1 (de) * 1981-12-23 1983-07-14 Siemens AG, 1000 Berlin und 8000 München Schaltungsanordnung zur unterdrueckung von signalen auf leitungsabschnitten

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
MORGAN, D.R. ET AL.: "Adaptive Interference Cancellation for Power Line Carrier Communication Systems", IEEE TRANSACTIONS ON POWER DELIVERY, vol. 6, no. 1, January 1991 (1991-01-01), pages 49 - 61 *

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999003209A3 (fr) * 1997-07-11 1999-08-12 Northern Telecom Ltd Transmission de signaux de communication a travers un reseau de distribution d'energie electrique
WO1999018675A3 (fr) * 1997-10-03 1999-06-24 Northern Telecom Ltd Couplage de signaux de communications avec une ligne de transport d'energie
US6404773B1 (en) 1998-03-13 2002-06-11 Nortel Networks Limited Carrying speech-band signals over a power line communications system
WO1999048222A1 (fr) * 1998-03-17 1999-09-23 Northern Telecom Limited Transmission de signaux de telecommunications sur un reseau de lignes d'alimentation
US5977650A (en) * 1998-03-17 1999-11-02 Northern Telecom Limited Transmitting communications signals over a power line network
DE19821045A1 (de) * 1998-05-11 1999-11-18 Abb Research Ltd Vorrichtung und Verfahren zur Signaleinkopplung in Hoch- und Mittelspannungsleitungen
EP0959569A1 (fr) * 1998-05-11 1999-11-24 Abb Research Ltd. Méthode et appareille pour le couplage de signaux dans un càble haute ou moyenne tension
EP0961415A1 (fr) * 1998-05-25 1999-12-01 Abb Research Ltd. Méthode et appareil pour la transmission de données ou respectivement le couplage de signaux au moyen de lignes d'alimentation
EP0963058A3 (fr) * 1998-06-02 2004-03-31 Ibiden Industries Co., Ltd. Appareil et procédé de transfert sur des lignes électriques de distribution
WO2000021212A1 (fr) * 1998-10-07 2000-04-13 Krone Gmbh Procede et circuit pour la transmission de donnees sur des lignes de transport d'energie
EP1003294A3 (fr) * 1998-11-19 2002-05-15 Abb Research Ltd. Procédé de communication sur ligne à haute tension
EP1286476A1 (fr) * 2001-08-23 2003-02-26 Abb Research Ltd. Procédé pour transmettre des signaux de communication
FR2829640A1 (fr) * 2001-09-13 2003-03-14 Electricite De France Procede de transmission d'informations par signaux cpl hf dans une canalisation de transport d'energie electrique triphasee, et dispositif de couplage triphase pour signaux cpl hf pour sa mise en oeuvre
EP1294105A1 (fr) * 2001-09-13 2003-03-19 Electricité de France Procédé et dispositif de couplage pour la transmission de données dans un réseau d'alimentation triphasée
EP2146440A4 (fr) * 2007-04-25 2014-07-16 Zao Electro Com Procédé pour amener et lire un signal avec des données numériques dans le réseau de distribution d'électricité d'un immeuble
WO2009109731A1 (fr) * 2008-03-06 2009-09-11 Freedom Digital Networks Limited Procédé d'installation de réseau à courant porteur en ligne

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AU3701697A (en) 1998-02-25
US6785532B1 (en) 2004-08-31
GB9616142D0 (en) 1996-09-11
EP0916194B1 (fr) 2001-09-26
DE69706997D1 (de) 2001-10-31
ATE206255T1 (de) 2001-10-15
DE69706997T2 (de) 2002-04-04
EP0916194A1 (fr) 1999-05-19

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